Dental relator



March 29, 1927.

J. HOMER DENTAL RELATOR Filed July 1.5, 1925 ATTORNEYS Patented Mar. 29,1927.

curren STATES PATENT OFFICE.

JOSEPH HOMER, OF NEW YORK, N. Y.

DENTAL nELA'ron.

Application filed July 13, 1925.

This invention relates to a dental relatoL- whom a new set of teeth isbeing made.

A further object is to provide an improvement on my Patent No.races-74:. 1ssued August 7 1923, entitled Dental relator.

A further object is to provide a simple and efficient metallic liningforthe plastic bearing member referred to in the above mentioned patent,so that in the operation of the jaws the pivot points will slide onmetal and not on the plastic composition.

A further object concerns the provision, of a frame which is supportedat three points and is adapted for movement at each of these points.

A furtherobject is to provide a frame which is provided. adjacent thethree points of support with adjusting screws to limit the movement incertain directions.

A still further object is to provide a frame so formed as to permit theoperator an unobstructed view of and access to the moulds on the frame.

The invention is illustrated in figures, of which- Figure 1 is a planview of the device;

Figure 2 is a section taken on the line 2-2 of Figure 1;

Figure 3 is a plan'view of the upper cup;

Figure 4 is a section taken on the line 4-4 of Figure 2;

Figure 5 is a section taken on the line 55 of Figure 1;

Figure 6 is a perspective viewof one of the lining plates;

Figure 7 is a sectional view taken through one of the main bearing cupswith a modilied form therein;

Figure 8 is a perspective view of the lininc: used in Figure 7;

Figure 9 is a section of the portion shown in Figure 7 taken in a planeat rightangles thereto;

Figure 10 is a perspective view of a slightlv modified form of liningplate to that shown in Figure 6.

In its general aspect. the invention comprises a main frame on. whichthe lower member of a pair of moulds for forming a new set of teeth ismounted. On this main Serial No. 43,366.

frame at the rear are provided two posts on the upper ends of which arebearing cups in which is disposed plastic material. In accordance withthe previously mentioned patent of mine, this plastic material isadapted to receive the pivot members of the-movable frame carrying theupper jaw memben In accordance with. the improvement, I dispose withinthe plastic material the metallic plates or sleeves formed in anydesiredmanner, the pivot members of the movable frame adapted to bear on andslide in contact with such plates rather than moving directly in contactwith the plastic material. This eliminates the wear on the plasticmaterial. and preserves the form of the groove therein and also requiresless skill on the part of the operator. A further feature comprisesproviding an additional cup containing plastic material and metallinings at the front of the main frame but at a much higher level thanthe level of the two jaw members and providing a portion of the movableframe with a pivot member to rest in this upper cup. Thus, the movableframe is pivotally connected to the main frame at three points. Themovable frame is provided with adjusting screws adjacent the pivot pointso that movement downward beyond a certain point is prevented.

As shown in the drawings, the preferred form of the invention comprisesa frame having a base plate 10 and two pedestal posts. one of which isshown in Figure 2 and designated by the numeral 11. At the top of theseposts are disposed bearing cups 12 and .13. Within these cups aredisposed masses of plastic material 14-. and 15'. In this plasticmaterial are disposed metal linins: plates 16 and 17 The form of theplates shown in Figures 1, 2. 5 and 6 is one preferred form. Slidable onthese plates within the mass of plastic material are the pivot condvlesl8 and 19 of a movable frame member 20. This movable frame member standsforward to form an upper movable plate 21 adapted to support the uppermould or jaw the lower one 23 of which is mounted on the plate 10. Atthe forward end of the upper plate 21. I provide a vertical extensionarm 24 which extends upwardl v and forwardlv and is provided with apivot member 25 adapted to depend into a cup 26 filled with plasticmaterial 27 in a metal lining plate 28. this'cup being mounted on theupper forward end of an arm 29 tached. so

' which rises from one of the pedestal posts 11. The movable frame 20 isprovided with set screws 30 and 31 adjacent the pivot members 1S and 19.These set screws are adapted to be adjusted with reference to hearingsurfaces. one of which is indicated in dotted lines in Figure 2 anddesignated by the nu mere] 32. These bearing surfaces are connected tothe main frame and form extensions of the respective pedestal posts 11.The lower ends of the set screr. s are lapted to bear on these surfacesto limit the move ment of the rear end of the frame 20. A setscrew 33 ismounted on 24 and bears on :the upper surface of the cup 26 to limit thedownward movement of the pivot menr Fber-25.

As shown in Fig res 7. 8 and 9, I i provide a different lining; for theplastic in. terial in the cups. In these lip: res. the liningisshown inthe form of an open erdeiil cylinder such as 3 1 into which the pivotend If desired,

d w h of the :movable frame extends. cylinder 8% could be closed at oneo. out :departing from th spirit of the tion. The shape of these intheplastic mate is 1 a path of movement to the as -.e of the movable frameap roximately equivalent to the normal path of movement desired of thejaws.

In the operation of the device the dent st, knowing the generalcharacter of the w movement under treatment, selects the desiredliningsand then inserts these lini the plastic mas-s, after which thepivot hers are brought intocontact wit the llllll;

and manipulated until the lie has a sumed in the plastic mass the desnrelative position, so'that as movable j member i smoved \backa-nd forththe i-esultin r movement will be as nearly as possible that desired of:the jaws. The fact that the pivot members are sliding on metal surfaceswill g ve a'more positive. movement and will prevent wear on the plasticmateral. The fact that the movable frame is provided with supports atthree points will also permit more etiicient, simple movement andrequire less skill on the part of the operator. Frovision of set screwsadjacent the pivot point will permit of the proper limitat ons beinc;put .upon the movement and will also permit of a very accurate aligningof the n'iovah e frame so as to properly re er the upper jaw withrespect to the lower aw.

It is desirable to hold the laro e moulds. such as 22 and '23, on theirrespective plates, by providing; pins. such as and 36. stucl: into thejaw members and then passino; an elastic band 37 over the rear face ofthe plates to which the jaw members are atto hold the jaw members inposition.

Preferably the members 16, 1'? and 28 are made of stiff or rigid metal,such. as aluminum or bronze but if desired, may be made of pliable orsoft metal, such as tin foil or an alloy of load. In regard to thelining 8f. the same may be open at both ends as shown in Figure 8 or maybe closed as shown 39; in l ij jure 0. Also the bottom of the linino'341*. may be tapered instead of flat if "110d. These linings, as forinstance, 16. is shown as formed to permit a 'qht movement of the upperfr-me but sired. they could be formed round as shown l6 in Figure ltlwhereby a curved structure is presented ai'laptcd to peru'iit amoreinent in a curve which may he an arc of a circle or some othercurve. so as to permit n'iovements more nearly equivalent to natural jawmovements. It w ll also be evident that the condyles l8 and 19 may havetapered ones to receive a face bow or they may be ade oval or round. Itwill also be understood that other modified structures or forms might beused without in any way deng from the spirit of the invention.

hat I claim as my invent on is: 1. In a dental relator a fixed frai amova le f a me. said movable frame l avian" a pair vot members at therear thereof mountplane above the teeth of jaws carried fitted frame,said movable frame also ine; a pivot member d sposed forwardly at a strear pivot members, and bearing members carried by the fixed frame corr"iond ngzlv disposed thereon to cooperate with the pivot members of themovable frame. the two rear b airing}; mei'nbers being appreciablyhigher than the teeth mounted on .rai l stationary frame and formed aspockets open at thetop and one side while the forward hearing member isdisposed above the rear hearing members and is formed open at the top,and a guidin lining: member positioned .in each socltet adapted to guidesaid pivot members as they swing and as they move baclt and forth duringthe functioning of the movable frame whereby jaws mounted on therespective frames can be examined and observed and n'ianipulated fromthe front of the device without difficulty.

in a dental relrtor a fixed fran'ie having: a base and a pair of posts.each of the po ts having at the upper end a pocket open at the top andone side, the open sides facing each ..e arm extending from one of saidposts formed, w'. socket open at the top. said socl tet being: spacedsubstantially an c dit-itance from the other two sockets. movablefran'le havin a pivot n'icmhcr arranged in each of said sockets, andindependently adjusted means arranged adjacent .h socket for accuratelvaligning the mov-- able frame in respect to the stationarv frame.

JOSEPH HOMER.

